On 2F, Cheren will advise you about the pathways made by fallen columns. Keep an eye out for new Pokemon Druddigon and Golett you make your way through the area. Head through the center of the room and grab the Hyper Potion.

Walk up the ramp made by the column on the northeast side of the floor. A Stardust can be found on the ledge with the door leading to 3F.

On 3F, take the furthest south series of ramps clockwise around to the Shiny Stone. This makes certain Pokemon evolve -- Minccino in this game.

As Cheren holds off the bulk of Team Plasma on 4F, you'll have to fight five Plasma thugs on your way up. They have the usual Watchog, Liepard and Scraggy Pokemon, but you will have to fight a Krokorok, so have a Water Type attack ready. Just past the final Plasma goon is a Dragon Fang.

You'll have to battle four Grunts in a row without a rest period to heal or revive your Pokemon, so use items before talking to the group of Plasma goons on 6F. These enemies use Level 30-something Pokemon you've seen before: Watchog, Krokorok, and Trubbish.

You get to see the Legendary Pokemon at the top of the tower but you won't get to claim it for your own yet. Once back outside, you'll be directed back to the Relic Castle in the Desert Resort. Fly to Nimbasa City and take Route 4 to the Desert Resort in the west.

Cheren will stop you at the entrance to the castle. Talk to him and enter the first floor. You can now use the stairs here to reach B1F. Remember that you must WALK to avoid the sand pits in this area. Just move slowly around the perimeter of the pit.

Fight the Team Plasma Grunt on B1F and continue down to B2F via the sand pit.

A Max Potion can be found near where you land on B2F. In the southwest corner of the room, walk carefully across the sand pit to TM30 Shadow Ball. Take the sand pit in the southwest here to continue.

On B3F, walk carefully across the pit south of the first Plasma Grunt to get to a Max Revive.

Take the sand pit by the Max Revive to fall to a section of B4F with a Sun Stone. Take the stairs up to B2F and drop back down to B3F. Cross the southwest pit to the Team Plasma Grunt and the PP Up. Take the southwestern pit down to B4F.

In Pokemon White you will receive the Light Stone and in Black you will receive the Dark Stone. Once outside of Relic Castle, Professor Juniper will summon you to Nacrene City -- the museum specifically.

Fly to the Museum in Nacrene City and talk to the crowd there. You will be given the Stone to awaken the legendary dragon Pokemon -- but first you need to head to Opelucid City to confront the final Gym Leader. Head for Opelucid City via Route 8 / Moor of Icirrus.